1.查看防火墙状态
systemctl status firewalld
2.查看防火墙是否开机启动
systemctl is-enabled firewalld
3.关闭防火墙
systemctl stop firewalld
systemctl status firewalld
4.禁用防火墙（系统启动时不启动防火墙服务）
systemctl disable firewalld
systemctl is-enabled firewalld
原文：http://www.cnblogs.com/mm0712/p/7058578.html